Gregor Mendel quotes

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Gregor Mendel

Birthdate: 22. July 1822
Date of death: 6. January 1884

Gregor Johann Mendel was a scientist, Augustinian friar and abbot of St. Thomas' Abbey in Brno, Margraviate of Moravia. Mendel was born in a German-speaking family in the Silesian part of the Austrian Empire and gained posthumous recognition as the founder of the modern science of genetics. Though farmers had known for millennia that crossbreeding of animals and plants could favor certain desirable traits, Mendel's pea plant experiments conducted between 1856 and 1863 established many of the rules of heredity, now referred to as the laws of Mendelian inheritance.Mendel worked with seven characteristics of pea plants: plant height, pod shape and color, seed shape and color, and flower position and color. Taking seed color as an example, Mendel showed that when a true-breeding yellow pea and a true-breeding green pea were cross-bred their offspring always produced yellow seeds. However, in the next generation, the green peas reappeared at a ratio of 1 green to 3 yellow. To explain this phenomenon, Mendel coined the terms "recessive" and "dominant" in reference to certain traits. He published his work in 1866, demonstrating the actions of invisible "factors"—now called genes—in predictably determining the traits of an organism.

The profound significance of Mendel's work was not recognized until the turn of the 20th century with the rediscovery of his laws. Erich von Tschermak, Hugo de Vries, Carl Correns and William Jasper Spillman independently verified several of Mendel's experimental findings, ushering in the modern age of genetics. Wikipedia

Photo: Unknown author, NIH / Public domain

Works

Experiments in plant-hybridisation

Gregor Mendel

Quotes Gregor Mendel

„It concerns the opinion of Naudin and Darwin that a single pollen grain does not suffice for fertilization of the ovule. I used Mirabilis Jalappa for an experimental plant, as Naudin had done; the result of my experiment is, however, completely different. From fertilizations with single pollen grains, I obtained eighteen well-developed seeds, and from these an equal number of plants, of which ten are already in bloom“

— Gregor Mendel

Letter VIII, July 3rd, 1870.
Letters to Carl Nägeli

„The striking-regularity with which the same hybrid forms always reappeared whenever fertilisation took place between the same species induced further experiments to be undertaken“

— Gregor Mendel, book Experiments in plant-hybridisation

Introductory paragraph
Experiments in plant-hybridisation (1865)
Context: Experience of artificial fertilisation, such as is effected with ornamental plants in order to obtain new variations in colour, has led to the experiments which will here be discussed. The striking-regularity with which the same hybrid forms always reappeared whenever fertilisation took place between the same species induced further experiments to be undertaken, the object of which was to follow up the developments of the hybrids in their progeny.

„Darwin's statements concerning hybrids of the genera“

— Gregor Mendel

Letter VIII, July 3rd, 1870.
Here Mendel alludes to the now-discredit ideas of blending inheritance and pangenesis
Letters to Carl Nägeli
Context: Of the experiments of previous years, those dealing with Matthiola annua and glabra, Zea, and Mirabilis were concluded last year. Their hybrids behave exactly like those of Pisum. Darwin's statements concerning hybrids of the genera mentioned in The variation of animals and plants under domestication, based on reports of others, need to be corrected in many respects.

„It is willingly granted that by cultivation the origination of new varieties is favored, and that by man's labor many varieties are acquired which, under natural conditions, would be lost; but nothing justifies the assumption that the tendency to formation of varieties is so extraordinarily increased that the species speedily lose all stability, and their offspring diverge into an endless series of extremely variable forms. Were the change in the conditions the sole cause of variability we might expect that those cultivated plants which are grown for centuries under almost identical conditions would again attain constancy.“

— Gregor Mendel, book Experiments in plant-hybridisation

Experiments with Hybrids of Other Species of Plants
Experiments in plant-hybridisation (1865)

Change, Nature

„Of the experiments of previous years, those dealing with Matthiola annua and glabra, Zea, and Mirabilis were concluded last year. Their hybrids behave exactly like those of Pisum.“

— Gregor Mendel

Darwin's statements concerning hybrids of the genera mentioned in The variation of animals and plants under domestication, based on reports of others, need to be corrected in many respects.
Letter VIII, July 3rd, 1870.
Here Mendel alludes to the now-discredit ideas of blending inheritance and pangenesis
Letters to Carl Nägeli

„Three sacraments that contribute to life, baptism, confession, communion, have been used at Easter time. (Eucharist connects completely faith and baptism, God and man incompletely) Triumph: As expected of pious Christians, the joy of victory is heard in the midst of an unjust world; victory and not disparagement, insult, persecution. With the day of the victory of Christ, the Easter, the bonds are broken, the death and sin laid (?), and the Redeemer of mankind rises strongly the human race from night time and fetters, in blessed heights, heavenly gates!).“

— Gregor Mendel

Excerpt from a sermon on Easter delivered by Mendel, found in Folia Mendeliana (1966), Volume 6, Moravian Museum in Brünn.
Original: Drei Sakramente, die das Leben spenden: Taufe, Beichte, Kommunion sind zur Osterzeit eingesetzt worden. (Eucharistie verbindet vollkommen, Glaube und Taufe unvollkommen dem Gottmenschen). Sieg: Wie mutet es einen frommen Christen an, mitten in der ungerechten Welt von Sieg zu hören, und nicht wieder Hintansetzung, Beschimpfung, Verfolgung; auch Siegesfreude. Mit dem Siegestag Christi, mit dem Ostertag, sind die Bande zerrissen, die der Tod und die Sünde aufgelegt ( ? ), und stark erhebt sich das Menschengeschlecht mit seinem Erlöser aus Nachtzeit und Fesseln in weite selige Höhen, himmlische Gefilde!).
Sermon on Easter

Night, Christ, Joy, Victory

„Jesus let the infidels and Jews aside, he appeared only to the chosen apostles, he was concerned only with the faithful believers. To these he taught, rebuked, and sanctified, in order to perfect them to perfect the saints. This not only made sin and death be taken away from us, but by the resurrection of the Son of God grace was also obtained.“

— Gregor Mendel

Excerpt from a sermon on Easter delivered by Mendel, found in Folia Mendeliana (1966), Volume 6, Moravian Museum in Brünn.
Sermon on Easter
Original: Jesus ließ die Ungläubigen und Juden beiseite, er erschien nur den auserwählten Aposteln, er befaßte sich nur mit den treuen Gläubigen. Diese belehrte er, tadelte er und heiligte er, um sie zu vervollkommnen zu vollendeten Heiligen. i Nicht bloss Sünde und Tod ist von uns genommen, sondern durch die Auferstehung des Gottessohnes ist auch seine Gnade gewonnen.

Perfection, Appearance, Faith, God

„I am inclined to regard the separation of parental traits in the progeny of hybrids in Pisum as complete and thus permanent. The progeny of hybrids carries one or the other of the parental traits, or the hybrid form of the two; I have never observed gradual transitions between the parental traits or a progressive approach towards one of them. The course of development consists simply in this; that in each generation the two parental traits appear, separated and unchanged, and there is nothing to indicate that one of them has either inherited or taken over anything from the other“

— Gregor Mendel

April 18, 1867.
Letters to Carl Nägeli

Appearance, Parent

„The victory of Christ gained us the kingdom of grace, the kingdom of heaven. Easter is the sky banner flag, the flag of eternity, the victory blowing over the gates of the Holy City of Jerusalem.“

— Gregor Mendel

Excerpt from a sermon on Easter delivered by Mendel, found in Folia Mendeliana (1966), Volume 1-6, Moravian Museum in Brünn.
Sermon on Easter
Original: Der Sieg Christi hat uns das Reich der Gnade gewonnen, das Himmelreich. Osterfahne wird zur Himmelsfahne, zur Flagge der Ewigkeit, die siegreich weht über den Toren der Heiligen Stadt Jerusalem

Christ, Victory

„Jesus appeared to the disciples after the resurrection in various forms. He appeared to Mary Magdalene so that they might take him for a gardener. Very ingeniously these manifestation of Jesus is to our minds difficult to penetrate. (He appears) as a gardener. The gardener plants seedlings in prepared soil. The soil must exert a physical and chemical influence so that the seed of the plant can grow. Yet this is not sufficient. The warmth and light of the sun must be added, together with rain, in order that growth may result. The seed of supernatural life, of sanctifying grace, cleanses from sin, so preparing the soul of man, and man must seek to preserve this life by his good works. He still needs the supernatural food, the body of the Lord, which received continually, develops and brings to completion of the life. So natural and supernatural must unite to the realization of the holiness to the people. Man must contribute his minimum work of toil, and God gives the growth. Truly, the seed, the talent, the grace of God is there, and man has simply to work, take the seeds to bring them to the bankers. So that we "may have life, and abundantly."“

— Gregor Mendel

Mendel makes several allusions to biblical verses, including John 20:15, Matthew 25:26 and John 10:10.
Sermon on Easter
Original: Jesus erschien den Jüngern nach der Auferstehung in verschiedener Gestalt. Der Maria Magdalena erschien er so, daß sie ihn für einen Gärtner halten mochte. Sehr sinnreich sind diese Erscheinungen Jesu und unser Verstand vermag sie schwer zu durchdringen. (Er erscheint) als Gärtner. Dieser pflanzt den Samen in den zubereiteten Boden. Das Erdreich muss physikalisch-chemisch Einwirkung ausüben, damit der Same aufgeht. Doch reicht das nicht hin, es muß noch Sonnenwärme und Licht hinzukommen nebst Regen, damit das Gedeihen zustandekommt. Das übernatürliche Leben in seinem Keim, der heiligmachenden Gnade wird in die von der Sünde gereinigte, also vorbereitete Seele des Menschen hineingesenkt und es muß der Mensch durch seine guten Werke dieses Leben zu erhalten suchen. Es muss noch die übernatürliche Nahrung dazukommen, der Leib des Herrn, der das Leben weiter erhält, entwickelt und zur Vollendung bringt. So muss Natur und Übernatur sich vereinigen, um das Zustandekommen der Heiligkeit des Menschen. Der Mensch muß sein Scherflein Arbeit hinzugeben, und Gott gibt das Gedeihen. Es ist wahr, den Samen, das Talent, die Gnade gibt der liebe Gott, und der Mensch hat bloß die Arbeit, den Samen aufzunehmen, das Geld zu Wechslern zu tragen. Damit wir »das Leben haben und im Überflusse haben.

Sun, Appearance, Light, Nature